Brake adjuster



April 1939- s. GRAZIANQ E1- AL 2,153,042

BRAKE ADJUSTER Filed March 3, 1957 2 Sheets-Sheet l INVENTORS April 4,193 s. F. GRAZIANO El AL BRAKE ADJUSTER Filed March 3, 1937 2Sheets-Sheet 2 Patented Apr. 4, 1939 UNITED s'rA'rEs PATENT OFFICE Theinvention relates to improvements in adjusting brakes by adjusting allbrakes on a vehicle fromQone point.

Oneieature oi the invention is that it is applicable to all types oi twoshoe brakes, mechanically or hydraulically operated.

One important object relates to simplifying the wear'adjustment of abrake of this type, by adjustingall shoes oi all wheels irom one point.Figure 1 is a vertical section through a mechanical brake using ouradjuster, which is shown in cross-section, just inside thehead oi thebrake drum, showing the brake shoes in side elevation; 16 Figure 2 is asection corresponding to Figure l,

but showing a hydraulic brake;

Figure 3 is a sectional view showing the auxiliary cylinder .9, ofFigure 5;

Figure 4 is a sectional view showing the adjuster cylinder I, of Figure5; I

Figure 5 is a more or less diagrammatic showing of a. complete brakeadjusting system according to our invention;

Figure 6 shows elevation view of auxiliary cylinder 9, pedal ii brakeoperating means rod 3|,rod Ill partofour system. 1

In the brake of Figure 1, there is a rotatable drum 24, at the open sideof which is a support such as a novel backing plate 26, and within whichis arranged the brake friction means, the brake shoes 23. In'this typeof braking system a rod or cable operates the cam 2i, which presseswedge l4, down causing the wedge to spread the brake shoes 23, by therollers 2|, which are attached to the brake shoes by a novel pin 20. The

springs 8, keep brake shoes 23, from dragging on brake drumjl. At theopposite end of the brake shoes 22', is where our invention comes intouse and to advantage over other types 01- adjusters. The wheel-cylinderIt, being under constant pressure of the desired amount applies thispressure on the pistons II, they in turn press brake shoes 23, to theproper clearance toward the'drum 24. The spring I8, is to keep h rubberpacking cups II, constantly in position against pistons I'I.

. In the brake of Figure 2,, there is a rotatable drum 24, at the-opensideoi which is a support such as a novel backing plate 22,.and withinvwhich is arranged the brake friction means, the

, pbrake shoes-a. In this type ofbraking system the brakes are appliedby a, hydraulic-braking. cylinder, which is connected to-a master'c'ylinder which is actuated by the brake footf pedal.

: The springs 2, keep brake shoes iyiromdjragging on brake drum 2.4. Atthe opposite end of th brake shoes 23, is where our invention comes intouse in the same manner as previously explained in Figure 1.

Figure 3 is a. sectional view of the auxiliary 5 cylinder 9, which isattachedto any convenient place near the brake pedal of the vehicle sothat rod Ill is connected to-said pedal. This cylinder 9' is placed intothe system or made a part 01' the system to keep fluid in lines firm andconstant. 10 Rod I0, pushes piston II, pressing the fluid within saidcylinder into the lines 22, of Figure 5, thru opening I5, which is forline attachment. The spring I3, is used to keep the rubber packing cupI2, in its proper position against piston II. 15

Figure 4 is a sectional view of the adjuster cylinder I, which isattached horizontally to any part of the vehicle most convenient. Theadjuster cylinder I, consists of cylinder I, spring I, which is used tokeep rubber packing cup 5, in 20 its proper position against piston 4.Hand screw 3, screws into cylinder cap 2, which is screwed on the top ofadjuster cylinder I. The'opening 8, is where lines 22, of Figure 5, areattached.

Figure 5 is a diagrammatic view of the com- 25' plete brake adjusterwhich shows the adjuster cylinder I, connected by, lines 22, with theauxiliary cylinder 9, and the wheel cylinders, contained within thebrake drum 24, and the backing plate 26, on which they are anchored.

The fluid is fed into the system-through the top of adjuster cylinderI,'whieh is screw-capped i'or this purpose. When all wheel cylinders,auxiliary cylinder 8, lines 22, and adjuster cylinder 1, are

full of fluid the adjuster cylinder I, is assembled 35 as describedpreviously for Figure 4. To adjust the brakes on the vehicle from oneplace, you simply turn hand screw 3, which presses fluid from theadjuster cylinder I, into the lines 22, to the wheel cylinders, where inturn the fluid 40 presses the pistons out ward on the. brake shoes, tothe drums until the proper clearance isobtained; The hafid screw willthus hold the pressure constant at all brake shoes oi the braking systemof a vehicle. Theauxiliary cylinder 8 45.

comes into action when foot pedal is depressed, giving added pressure tothe lines and thereby solidly supporting brake shoes.

Figure 6 shows foot pedal 3!, rod III is attached to foot pedal 2!, rod3| oi brake applying 0' mechanism also connected to foot pedal 35. RodsII and llare both attached or connected by 'clevis pint... Rod Iliis putof our hydraulic brake adjustersystem, as explained above, and rod if isto apply brake mechanism to bring 55 vehicle to a stop, it is a part ofbrake operating means to spread brake shoes to bring rotation of drum tostandstill. 38 is holes through which clevis pin 34 is put so as toconnect rod l0. and rod 3! with brake pedal 35. Also cylinder 9- inrelation to above parts.

We claim:

1. In combination with a brake having brake constant firmness of fluidin said fluid operated device and connecting conduits. v e

2. In combination with brakes on a vehicle each liaving brake shoes andan operating means therefor, an hydraulic brake adjuster comprisingfluid operated devices placed at the ends of the brake shoes oppositethe brake shoes operating means and serving as a support for said.shoes; a manually operable cylinder device serving as a means to adjustand hold to permanent adjusted position said fluid operated devices; anda cylinder device connected to said fluid'operated devices by conduits,and adapted, when positively operated' during application of the brakeshoes, to keep constant firmness of fluid in said fluid operated devicesand connecting conduits, to adjust all brake shoes on a vehicle, at thesame time. SAM F. GRAZLANO. SAM J. CICERO.

